2151709843 has 4 divisors (see below), whose sum is σ = 2151814960. Its totient is φ = 2151604728.

The previous prime is 2151709841. The next prime is 2151709909. The reversal of 2151709843 is 3489071512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2151709843 - 2¹ = 2151709841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2151709796 and 2151709805.

It is not an unprimeable number, because it can be changed into a prime (2151709841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10788 + ... + 66481.

It is an arithmetic number, because the mean of its divisors is an integer number (537953740).

Almost surely, 2^2151709843 is an apocalyptic number.

2151709843 is a deficient number, since it is larger than the sum of its proper divisors (105117).

2151709843 is an equidigital number, since it uses as much as digits as its factorization.

2151709843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105116.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 2151709843 is about 46386.5265244122. The cubic root of 2151709843 is about 1291.0049343387.

The spelling of 2151709843 in words is "two billion, one hundred fifty-one million, seven hundred nine thousand, eight hundred forty-three".